To setup the Walmart Marketplace integration, please head to your retailer company and within the advanced settings head to "Sales Channel Integrations" and click to enable the Walmart Marketplace option. This had been shown below.
When setting this up you will need to set your "Customer ID", "Client ID" and "Client Secret" which will be provided to you from Walmart before you setup the integration with us. Users also have the option to enable this integration into a Sandbox mode to ensure you can test the integration before